高压下CO_2-异丙醚体系的汽液相平衡

High pressure vapor-liquid equilibrium for the carbon dioxide-diisopropyl ether binary system

采用带有可视石英玻璃窗的高压汽液相平衡装置，测定了压力0.5-2.5 MPa、温度265.15-333.15 K条件下CO2-异丙醚体系的二元汽液相平衡数据，并通过了热力学一致性检验。用Peng-Robinson（PR）状态方程对CO2-异丙醚体系的汽液相平衡数据进行关联，得到该方程的二元交互作用参数。结果表明，体系的汽液相平衡数据计算值与实验值偏差较小，可采用PR方程对CO2-异丙醚二组分物系的汽液相平衡数据进行预测。

An experimental device incorporating vision windows, for measuring vapor-liquid equilibrium （VLE） data at high-pressures is described. Online-sampling of the vapor and liquid phases can be carried out by gas chromatography. The vapor-liquid equilibrium （VLE） data for the binary system carbon dioxide：diisopropyl ether have been measured at 265.15 - 333.15 K and 0.5 - 2.5 MPa. The experimental data set passed the thermodynamic consistency test. An isothermal correlation of the experimental data has been carried out based on the Peng-Robinson （PR） equation and the correlated results accord with the experimental data. The results show that the VLE data for the binary system carbon dioxide-diisopropyl ether can be calculated by the PR equation.